... Asia Industrial telephone,anti-explosion telephone, dust proof telephone KNSP-13 Applications: As Public telephone for indoor or outdoor, Taxi or ... . Handfree4. Telephone line powered.5. Lightening protection to ITU-T K.216. Handset: high anti-knock resistance, weatherproof, armoured cable optional7 ... Ohm. Industrial telephone,anti-explosion telephone, dust proof telephone KNSP-13